D defs.my
Entry 2 senses Webster, 1913

lead-in

· IPA /ˈliːdɪn/
01 n. a wire connecting an antenna to a receiver or a transmitter to a transmission line.
  1. 1.
    a wire connecting an antenna to a receiver or a transmitter to a transmission line.(Elec.)
  2. 2.
    The short segment of a program or program script introducing and immediately preceding another part of the program or a commercial.(Radio and Television Broadcasting)